Yohtaro tjchida



Y. UCHlDA.

ELECTRIC autumn LmnER.

APPLICAHON FLLED JUNE 18'. I917.

Patented July 22, 1919.

YOHTARO UCHIDA, OF TOKYO, JAPAN.

ELECTRIC-CURRENT LIMITER.

Specification of Letters Patent.

Patented July 22, 1919.

Application filed June 18, 1917. Serial No. 175,467.

To all H lton/4:2. may com-cm.

lieit known that l. Yon'rano llcnnn, a subject of the Emperor of Japan,residing at No. 10 l-Cliome, Shin-ami-cho, Azabu Kn, Tokyo, Japan,engineer, have invented certain new and useful Improvements inlllectric-(fnrrent liimiters, of which the following is a specification.

This invention relates to a circuit breaker and aims to provide one ofthe magnetic type wherein all danger of sparking when the circuit isbroken will be eliminated, in addition to the provision of a device ofthis nature which will have a smooth and positive action.

This invention further aims to provide a device of this nature whereinthe flow of current will not be stopped after the circuit has beenbroken by the breaker, but rather where the current will be directed toa circuit wherein there is a resistance sufficient to insure that a toogreat flow of current will never exist.

In the accompanying drawings, wherein I have disclosed a sectional sideelevation of my device, it will be seen that the reference numeral 1 isapplied to a housing, preferably constructed of glass, so that thedevice may be viewed in operation, as well as obtaining the benefit ofthe insulating qualities of this material and itsbeing non-effected bygases, etc.

The lower end of the tube or container 1 is divided by means of apartition wall 2, forming chambers 3 and 3' which are adapted to befilled with mercury. Contacts 4 and 4 project into the lower end of thechambers 3 and.3'- and contact with the mercury. The upper end of thetube or container 1 is open and is greatly enlarged, the opened endbeing closed by means of a stopper or other suitable device 5,inc-losing a tube 6 permitting of the escape of gases which might begenerated. A shield 18' is suspended from the sto per 5 for a purposehereinafter to be speci ed.

A fluid 7, which ispreferably mineral oil, as it must embody thefollowing qualities, that it be non-corrosive for the metal used, aninsulating substance, the specific gravity of which should be differentfrom that of mercury, is filled into the container 1 to approximatelythe level indicated in the drawmg.

- A tube 8 housing a number of iron rods, or similar metallic materialwhich is capable of being acted upon by magnetic influences, issuspended in the liquid 7, a contacting fork being adjustably secured bymeans of the adjusting nut 13 to the lower end of the tube 8. It will benoted from the drawings that the ends of the fork 10 project into theupper surface of the mercury thus bridging the gap between the contactmembers 4 and l and permitting a How of current fromone to the other.

Housed in the upper end of the tube 8 is a shock absorbing substancewhichimay be raw cotton, preventing the breakage of the tube 8 by meansof any sudden motion which would impart a hammer-like action to themetallic fillers 9.

A main coil 11', and circle the indicated auxiliarycoil 11' envessel orcontainer ata point in the drawings, which point is slightly above theusual horizontal plane in The end of the eonductor l is electricallyconnected with the which the tube 8 rests.

end of the main coil 11 and the beginning of the auxiliary COll 11. Theconductor 4 has an electrical connection at the terminal end of theauxiliary coil and a low circuit, the

main coil being so arranged as to connect with the supply circuit andthe circuit of the auxiliary co'il having a suitable resistance 12. romthe above it will be seen that the current normally passes from thecontact 4: through the fork 10 to the contact 4, etc.

Granting now that a too great amount of current is beingintroduced intothe circuit, the magnetism of the coils 11 and 11' will become greatlyincreased and the tube 8, Which is held down by the weight of themagnetic filling 9 and the fork 10 will be acted upon by such coils, dueto the substance 9 in the tube 8, causing the tube to rise through thefluid 7 or to the position indicated in dotted lines, thus breaking thecircuit bridged by the fork members 10. As soon as this action has takenplace it will be seen that the circuit will now pass through theauxiliary coil to the external circuit by means of the resistance 12inserted therein. Having now described my invention what I claim is Acircuit breaker including a tube, contacts located in the bottomthereof, such tube being filled throughout its operative length with afluid, a movable member with- In testimony whereof I affix my signaturein such tube,1means secured to thellower end in presence of twoWitnesses.

of said ll'l8111)01 for bridging sale contacts, T

and a magnet above said movable member, XOHTARO UCHIDA' and a shieldextending from the top of such Witnesses: tube adapted to prevent toogreat a vertical H. F. .IIAWLEY, motion of the movable member. H.YASUMURE.

copies 0! this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents,

Washington, D. G.

